Modified CODEOWNERS for new graph files

Author: konradkusiak97

.github/CODEOWNERS

@@ -163,10 +163,8 @@ libdevice/nativecpu* @intel/dpcpp-nativecpu-reviewers
 
 # SYCL-Graphs extensions
 sycl/include/sycl/ext/oneapi/experimental/graph.hpp @intel/sycl-graphs-reviewers
-sycl/source/detail/graph_impl.cpp @intel/sycl-graphs-reviewers
-sycl/source/detail/graph_impl.hpp @intel/sycl-graphs-reviewers
-sycl/source/detail/graph_memory_pool.hpp @intel/sycl-graphs-reviewers
-sycl/source/detail/graph_memory_pool.cpp @intel/sycl-graphs-reviewers
+sycl/include/sycl/ext/oneapi/experimental/graph @intel/sycl-graphs-reviewers
+sycl/source/detail/graph @intel/sycl-graphs-reviewers
 sycl/unittests/Extensions/CommandGraph/ @intel/sycl-graphs-reviewers
 sycl/test-e2e/Graph @intel/sycl-graphs-reviewers
 sycl/doc/design/CommandGraph.md @intel/sycl-graphs-reviewers